CN111723621B - Image acquisition device and electronic equipment - Google Patents

Image acquisition device and electronic equipment Download PDF

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Publication number
CN111723621B
CN111723621B CN201910220474.XA CN201910220474A CN111723621B CN 111723621 B CN111723621 B CN 111723621B CN 201910220474 A CN201910220474 A CN 201910220474A CN 111723621 B CN111723621 B CN 111723621B
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Prior art keywords
image
sensing module
display panel
image sensing
optical imaging
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CN111723621A (en
Inventor
张文应
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Shanghai Harvest Intelligence Tech Co Ltd
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Shanghai Harvest Intelligence Tech Co Ltd
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Priority to CN201910220474.XA priority Critical patent/CN111723621B/en
Priority to TW109107099A priority patent/TWI768298B/en
Priority to US16/821,479 priority patent/US11656700B2/en
Publication of CN111723621A publication Critical patent/CN111723621A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/60—Type of objects
    • G06V20/64—Three-dimensional objects
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • G06V40/166—Detection; Localisation; Normalisation using acquisition arrangements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/172—Classification, e.g. identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion

Abstract

The invention provides an image acquisition device and an electronic device, wherein the image acquisition device comprises: the display device comprises a protective layer, a display panel, a first image sensing module, an optical imaging element and a second image sensing module; the protective layer is arranged on a first side of the display panel along the thickness direction of the display panel and is provided with a first surface for contacting a part to be detected; the display panel comprises a plurality of display pixels, and the display pixels are suitable for emitting first light signals; the first image sensing module, the optical imaging element and the second image sensing module are arranged on the second side of the display panel along the thickness direction of the display panel; the first image sensing module is adapted to receive a reflected light signal formed by a first light signal on a first surface of the protective layer, the optical imaging element is adapted to optically image based on a second light signal received by the optical imaging element from an object above the first surface of the protective layer, and the second image sensing module is adapted to receive a second light signal imaged by the optical imaging element.

Description

Image acquisition device and electronic equipment
Technical Field
The present invention relates to the field of image acquisition technologies, and in particular, to an image acquisition device and an electronic device.
Background
With the development of industrial design and the popularization of comprehensive screen intelligent equipment, an under-screen fingerprint identification technology is generated, and compared with a traditional front scraping type or pressing type fingerprint unlocking technology, the under-screen fingerprint identification technology can further improve the appearance and user experience of the intelligent equipment.
Currently, the mainstream technologies of under-screen fingerprint recognition mainly include optical fingerprint recognition and ultrasonic fingerprint recognition technologies, wherein the optical fingerprint recognition technologies illuminate a finger area by using light of a mobile phone display screen as a light source so as to acquire a fingerprint image. The technology is developed gradually in the last three years, and a plurality of suppliers in the industry chain realize mass production of fingerprint sensors under an optical screen and are loaded in various intelligent products at the present stage.
In addition to fingerprint identification, face recognition and iris identification are taken as other two biological identification technologies, so that the novel break-over of the full screen era is realized, the iris identification is one of the biological identification technologies with higher safety at present due to low false recognition rate, and the pressure of mobile phone manufacturers is increased due to higher cost. The principle of the face recognition technology is that a camera collects 2D images containing faces, a structured light scheme and a double-shot algorithm are adopted to realize the recognition function, the 3D face recognition has the advantages of high resolution of image quality, and the face recognition technology is also provided with opportunities based on the current mat trend of the 3D camera on the smart phone.
Disclosure of Invention
In order to enable the comprehensive screen intelligent device to have multiple biological recognition functions and improve the safety of biological recognition by means of the integrated structural design, the embodiment of the invention provides an image acquisition device, which comprises: the display device comprises a protective layer, a display panel, a first image sensing module, an optical imaging element and a second image sensing module; the protective layer is arranged on a first side of the display panel along the thickness direction of the display panel, and the protective layer is provided with a first surface for contacting a part to be detected; the display panel comprises a plurality of display pixels, and the display pixels are suitable for emitting first light signals; the first image sensing module, the optical imaging element and the second image sensing module are arranged on a second side of the display panel along the thickness direction of the display panel; the first image sensing module is suitable for receiving a reflected light signal formed by reflecting the first light signal on the first surface of the protective layer, the optical imaging element is suitable for optical imaging according to a second light signal received by the optical imaging element from an object above the first surface of the protective layer, and the second image sensing module is suitable for receiving a second light signal imaged by the optical imaging element.
Optionally, the first image sensing module is disposed between the display panel and the optical imaging element.
Optionally, the first image sensing module is attached to a surface of the second side of the display panel along the thickness direction thereof.
Optionally, a first distance is between the optical imaging element and the display panel, and a second distance is between the optical imaging element and the second image sensing module.
Optionally, the display panel is disposed on an object focal plane of the optical imaging element, and the second image sensing module is disposed outside an image focal plane of the optical imaging element.
Optionally, the second distance is adjustable within a preset range, and the preset range satisfies: an object located above the first surface of the protective layer and having a distance from the first surface in the range of 0.1 meters to 1 meter forms a clear image at the second image sensing module.
Optionally, the optical imaging element is disposed opposite to the first image sensing module, and a region of the first image sensing module opposite to the optical imaging element has light transmittance.
Optionally, the surface of the second side of the display panel along the thickness direction of the display panel includes a first area and a second area located outside the first area, the first image sensing module is disposed in the first area, and the optical imaging element is disposed opposite to the second area, so that the second optical signal sequentially passes through the protective layer and the display panel and is received by the optical imaging element.
Optionally, the image acquisition device further includes an optical filter, disposed between the display panel and the first image sensing module, adapted to select light rays having an incident angle and a wavelength satisfying a preset condition to pass through, and filter light rays having an incident angle and a wavelength not satisfying the preset condition.
Optionally, an area of the optical filter device opposite to the optical imaging element is provided with an aperture.
Optionally, the image acquisition device further comprises: and the reflecting film is arranged on the surface of the second side of the display panel along the thickness direction and is suitable for reflecting the first optical signals emitted by the display pixels and facing the first image sensing module.
Optionally, an area of the reflective film opposite the optical imaging element is provided with an aperture.
Optionally, the image acquisition device further comprises: the processing module is suitable for sending a display driving signal to the display panel, generating first image information according to the reflected light signal received by the first image sensing module, and generating second image information according to the second light signal received by the second image sensing module.
Optionally, the image acquisition device further comprises: the touch screen is arranged between the protective layer and the display panel and is suitable for detecting touch signals from the first surface of the protective layer; the processing module is suitable for sending a display driving signal to the display panel when the touch screen detects a touch signal.
Optionally, the protective layer includes a light-transmitting cover plate; the display panel comprises a light emitting diode display screen; the first image sensing module comprises a plurality of photosensitive pixels, each photosensitive pixel comprises a pixel circuit and a photosensitive element, the pixel circuit comprises a thin film transistor, and the photosensitive element comprises a photodiode or a phototransistor; and/or the second image sensing module comprises a CMOS image sensor.
Correspondingly, the embodiment of the invention also provides electronic equipment, which comprises: processor, memory, and image acquisition device of the embodiment of the invention.
Optionally, the electronic device includes a mobile phone or a tablet computer.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the image acquisition device provided by the embodiment of the invention has the functions of near-field imaging and midfield imaging, wherein the protective layer, the display panel and the first image sensing module form a near-field imaging module which can be used for optical imaging of an object (such as an object contacted with the first surface of the protective layer) near the first surface of the protective layer; the optical imaging element and the second image sensing module form a midfield imaging module which can be used for optical imaging of an object with a distance from the first surface of the protective layer within a preset range. The near field imaging module can be applied to off-screen fingerprint identification, the midfield imaging module can be applied to off-screen face identification, so that the image acquisition device can simultaneously realize the off-screen fingerprint identification and the off-screen face identification through the integrated structural design, and the functional integration level of the image acquisition device applied in the comprehensive screen intelligent equipment is improved.
Further, the display panel is arranged on the object focal plane of the optical imaging element, so that a display image on the display panel can be imaged at infinity through the optical imaging element, interference of the display image on the display panel on the second image sensing module to the second optical signal received from an object is avoided, and the signal-to-noise ratio of the image acquired by the second image sensing module is improved; the second image sensing module is arranged outside an image space focal plane of the optical imaging element, so that the optical imaging element can clearly image an object with a distance from the first surface of the protective layer within a preset range to the second image sensing module.
Further, the optical imaging element is arranged opposite to the first image sensing module, and the area, opposite to the optical imaging element, of the first image sensing module has light transmittance, so that the intensity of a second optical signal received by the second image sensing module is enhanced, and the signal to noise ratio of the acquired image is improved.
Further, the image acquisition device further comprises an optical filter device, ambient light can be filtered, only signal light meeting bandpass conditions is allowed to pass through, the signal to noise ratio of an image acquired by the first image sensing module is improved, an opening is formed in an area, opposite to the optical imaging element, of the optical filter device, the optical filter device is prevented from filtering a second optical signal of an object above the surface of the protective layer, and compatibility between near-field imaging and far-field imaging can be achieved.
Further, the image capturing device further includes a reflective film disposed on a surface of the second side of the display panel along the thickness direction thereof, and adapted to reflect the first light signal emitted from the display pixel and directed toward the first image sensing module, so that on one hand, the intensity of the first light signal reaching the first surface of the protective layer for capturing a fingerprint image is enhanced, and on the other hand, the intensity of the first light signal emitted from the display panel and directly entering the first image sensing module is reduced, thereby improving the signal-to-noise ratio of the image captured by the first image sensing module. And an opening is formed in the area, opposite to the optical imaging element, of the reflecting film, so that the reflecting film is prevented from blocking a second optical signal of an object above the first surface of the protective layer, and compatibility between near-field imaging and far-field imaging is realized.
The electronic equipment provided by the embodiment of the invention comprises the image acquisition device, so that the electronic equipment can have the acquisition functions of near-field and far-field images through an integrated structural design, and can be simultaneously applied to off-screen fingerprint identification and off-screen face recognition.
Drawings
Fig. 1 is a schematic structural view of an image pickup apparatus 10 according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an image capturing device 20 according to another embodiment of the present invention;
fig. 3 is a schematic structural view of an image capturing device 30 according to another embodiment of the present invention;
fig. 4 is a partial enlarged view of the first aperture 3211, the second aperture 391 and the light-transmitting region 331 of the image capturing device 30 according to the embodiment of the present invention shown in fig. 3;
fig. 5 is a schematic structural view of an image capturing device 40 according to another embodiment of the present invention;
fig. 6 is a block diagram of an electronic device 50 according to one embodiment of the invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other.
Referring to fig. 1, fig. 1 is a schematic structural view of an image capturing apparatus 10 according to an embodiment of the present invention. In some embodiments, the image capture device 10 may include a protective layer 11, a display panel 12, a first image sensing module 13, an optical imaging element 14, and a second image sensing module 15.
The protective layer 11 is disposed on a first side of the display panel 12 along a thickness direction thereof, and the protective layer 11 has a first surface 11a for contacting a portion to be detected. In some embodiments, the protective layer 11 may be a single-layer structure or a multi-layer structure, and the single-layer structure may be a Glass Cover Glass (CG) or an organic light-transmitting Cover plate, or may be a Cover plate having other functions, for example, may be a touch screen. The multilayer structure can be a multilayer glass cover plate, a multilayer organic light-transmitting material cover plate or a combination of the glass cover plate and the organic light-transmitting material cover plate. The part to be detected can be a part with physiological characteristic line information such as a finger or a palm.
The display panel 12 comprises a plurality of display pixels adapted to emit first light signals not only for displaying an image, but also as a light source for capturing an image by the image capturing mechanism 10. In some embodiments, the display panel 12 may include an array of light emitting diodes, for example, the display panel 12 may be an organic light emitting diode (Organic Light Emitting Diode, OLED) display, or a micro-light emitting diode (micro-LED) display, or the like. The single or multiple pixels in the display panel 12 serve as light sources adapted to emit first light signals in different directions towards the first surface 11a of the protective layer 11, which first light signals are reflected at the first surface 11a of the protective layer 11, forming reflected light signals in different directions.
The first image sensing module 13, the optical imaging element 14, and the second image sensing module 15 are disposed on a second side of the display panel 12 in a thickness direction thereof. Wherein the first image sensing module 13 is adapted to receive a reflected light signal formed by reflecting the first light signal on the first surface 11a of the protective layer 11, the optical imaging element 14 is adapted to receive a second light signal from the object 18 above the first surface 11a of the protective layer 11 and to perform optical imaging according to the received second light signal, and the second image sensing module 15 is adapted to receive the second light signal imaged by the optical imaging element 14. Wherein the object 18 may be in non-contact with the first surface 11a of the protective layer 11.
In some embodiments, the first image sensing module 13 is disposed between the display panel 12 and the optical imaging element 14, wherein the first image sensing module 13 may be disposed to be attached to a surface 12a of the second side of the display panel 12 in the thickness direction thereof. In this embodiment, the protective layer 11, the display panel 12, and the first image sensor module 13 form a near-field imaging module, which may be used to capture an image of an object near the first surface 11a of the protective layer 11, for example, to capture an image of a fingerprint 17 that contacts the first surface 11a of the protective layer 11. When the near-field imaging module is used for collecting the fingerprint 17, fingerprint imaging can be performed by utilizing a physical optical total reflection imaging principle, that is, the first image sensing module 13 is adapted to receive total reflection light formed by total reflection of the first optical signal on the first surface 11a of the protective layer 11, and process fingerprint image data by using the partial total reflection light as effective signal light carrying fingerprint information, so as to obtain a fingerprint image.
In some embodiments, the optical imaging element 14 may be a first distance from the display panel 12, and the optical imaging element 14 may be a second distance from the second image sensing module 15. Specifically, the display panel 12 may be disposed on the object focal plane of the optical imaging element 14, and because the light emitted from any point on the object focal plane is imaged by the optical imaging element 14 and then converted into parallel light, the display image on the display panel 12 may be imaged at infinity through the optical imaging element 14, which is equivalent to a uniform illumination light source, so that the display image with a pattern is prevented from being difficult to be filtered out by the interference signal of the second optical signal received by the second image sensing module 15 after being received by the second image sensing module. The second image sensing module 15 may be disposed outside the image-side focal plane of the optical imaging element 14, that is, the second distance is greater than the focal length of the optical imaging element 14, so that the object 18 above the first surface 11a of the protective layer 11 can be imaged in real form on the second image sensing module 15 after passing through the optical imaging element 14.
In some embodiments, the second distance is adjustable within a preset range, the preset range satisfying: when the object 18 above the first surface 11a of the protective layer 11 is 0.1 to 1 meter from the first surface 11a, a clear image can be formed on the second image sensing module 15.
In some embodiments, the optical imaging element 14 may include a lens or a lens group, and the object 18 forming a clear image on the second image sensing module 15 includes: the distance between the object 18, the optical imaging element 14 and the second image sensing module 15 satisfies the lens imaging formula:where s is the third distance (i.e. the distance between the object 18 and the optical imaging element 14), i is the second distance (i.e. the distance between the optical imaging element 14 and the second image sensing module 15), and f is the focal length of the optical imaging element 14.
In some embodiments, the image acquisition device 10 further comprises a distance adjustment device (not shown) adapted to adjust the second distance within a preset range. In particular, the distance adjustment means may comprise a voice coil motor adapted to adjust the second distance in the range of 0.5 mm.
In some embodiments, the first image sensing module 13 is disposed opposite the optical imaging element 14, and the region 131 of the first image sensing module 13 opposite the optical imaging element 14 has optical transparency such that the optical imaging element 14 is able to receive as much of the second optical signal from the object 18 above the first surface 11a of the protective layer 11 as possible.
In particular, the first image sensing module 13 may be a glass substrate-based image sensor fabricated in an amorphous silicon thin film transistor (Thin Film Transistor, TFT) process, the TFT image sensor including a plurality of photosensitive pixels, each of which may include a pixel circuit including a thin film transistor and a photosensitive element including a photodiode or a phototransistor. The photodiodes and thin film transistors of the light-transmitting region 131 may be fabricated on a transparent material.
In some embodiments, the second image sensing module 15 may be a silicon wafer based image sensor fabricated in CMOS process, and the optical imaging element 14 may be a lens or a lens group adapted to image the object 18 according to geometrical optics principles.
In this embodiment, the optical imaging element 14 and the second image sensing module 15 form a midfield imaging module, which can be used for optical imaging of an object 18 located above the first surface 11a of the protective layer 11 and having a predetermined distance from the first surface 11a of the protective layer 11, for example, for off-screen face recognition when the midfield imaging module is applied to a full-screen smart device.
In some embodiments, the image capturing device 10 may further include a touch screen 16, where the touch screen 16 is disposed between the protective layer 11 and the display panel 12 and is adapted to detect a touch signal from the first surface 11a of the protective layer 11.
In some embodiments, the image capturing device 10 may further include a processing module (not shown) adapted to send a display driving signal to the display panel 12 when the touch screen 16 detects a touch signal, where the processing module is further adapted to generate first image information according to the reflected light signal received by the first image sensing module 13 and generate second image information according to the second light signal received by the second image sensing module 15.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an image capturing device 20 according to another embodiment of the present invention.
In some embodiments, the image capture device 20 may include a protective layer 21, a display panel 22, a first image sensing module 23, an optical imaging element 24, and a second image sensing module 25.
In some embodiments, the image capture device 20 may further include a touch screen 26 disposed between the protective layer 21 and the display panel 22.
This embodiment differs from the embodiment shown in fig. 1 in that: the surface 22a of the second side of the display panel 22 along the thickness direction thereof includes a first area I and a second area II located outside the first area I, the first image sensing module 22a is disposed in the first area I, and the optical imaging element 24 is disposed opposite to the second area II, so that the second optical signal passes through the protective layer 21, the touch screen 26 and the display panel 22 in sequence and is directly received by the optical imaging element 24, without passing through the first image sensing module 23, which is beneficial to improving the intensity of the second optical signal received by the second image sensing module 25, and further improving the signal-to-noise ratio of the image acquired by the second image sensing module 25. However, in comparison with the embodiment shown in fig. 1, the present embodiment is adapted to implement fingerprint recognition in a partial area of the first surface 21a of the protective layer 21 (i.e., a partial area facing the first area I of the display panel 22).
When the image capturing apparatus 20 of the present embodiment is applied to an intelligent device of a full-screen, the optical imaging element 24 and the second image sensing module 25 may be disposed directly under the full-screen near the edge area thereof, so as to implement face recognition. For example, a sea-going screen or a water-drop screen of some mobile phones on the market today may be used to provide the midfield imaging module, that is, the optical imaging element 24 and the second image sensing module 25, in the image capturing device 20 according to the embodiment of the present invention.
In fig. 2, the proportion of the display panel 22 occupied by the second area II is enlarged, and in practice, the proportion of the first area I and the second area II may be set as needed, which is not limited in the embodiment of the present invention, in order to clearly show the positional relationship between the first image sensor module 23 and the second image sensor module 25.
The structure and function of each component of the image capturing device 20 in this embodiment may refer to the embodiment shown in fig. 1, and will not be described herein.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an image capturing device 30 according to another embodiment of the present invention.
In some embodiments, the image capture device 30 may include a protective layer 31, a display panel 32, a first image sensing module 33, an optical imaging element 34, and a second image sensing module 35.
In some embodiments, the image capturing device 30 may further include a touch screen 36 disposed between the protective layer 31 and the display panel 32.
The difference between this embodiment and the embodiment shown in fig. 1 is that the image capturing device 30 may further include: the reflective film 321 and/or the optical filter 39, where the reflective film 321 is disposed on a surface of the second side of the display panel 32 along the thickness direction thereof, and is adapted to reflect the first optical signal emitted by the display pixel of the display panel 32 and directed toward the first image sensing module 33, so as to prevent the first optical signal from being directly received by the first image sensing module 33, resulting in an increase in ambient light and a weakening of the signal light duty ratio, and further resulting in a reduction in the signal-to-noise ratio of the acquired image. In some embodiments, the reflective film 321 may be a metallic film or a non-metallic film. When the reflective film 321 is a metal film, the reflective film 321 may have an extremely thin thickness to achieve at least partial light transmission.
The optical filter 39 is disposed between the display panel 32 and the first image sensor module 33, and is adapted to select light rays having an incident angle and a wavelength satisfying a preset condition to pass through, and to filter light rays having an incident angle and a wavelength not satisfying the preset condition. In some embodiments, the preset condition may be λ=ncos θ, where λ and θ are the wavelength of the incident light and the exit angle of the incident interface of the optical filter device 39, n is the refractive index of the optical filter device 39, d is the thickness of the optical filter device 39, and the exit angle θ is a function of the incident angle θ' of the light at the incident interface of the optical filter device 39.
In some embodiments, the optical filter 39 may be an optical film formed by combining several layers of materials with different optical refractive indices, or a photonic crystal structure device with a periodically varying refractive index.
In some embodiments, the reflective film 321 is provided with a first aperture 3211 in a region facing the optical imaging element 34. The area of the optical filter 39 opposite to the optical imaging element 34 is provided with a second opening 391, the area of the first image sensor module 33 opposite to the optical imaging element 34 is provided with a light transmission area 331, and the first opening 3211, the second opening 391 and the light transmission area 331 facilitate the optical imaging element 34 and the second image sensor module 35 to receive more second optical signals from the object 38, so as to avoid blocking by the reflective film 321, the optical filter 39 and the first image sensor module 33.
The structure and function of each component of the image capturing device 30 in this embodiment may refer to the foregoing embodiments, and will not be described herein.
Referring to fig. 4, fig. 4 is a partial enlarged view of the first opening 3211, the second opening 391 and the light-transmitting region 331 of the image capturing apparatus 30 according to the embodiment of fig. 3 of the present invention.
In some embodiments, the first aperture 3211, the second aperture 391, and the light-transmitting region 331 may have the same size d2, and the size d2 of the plurality of apertures and the light-transmitting region may be approximately determined using the method shown in fig. 4. For simplicity of explanation, the structures of the protective layer 31, the display panel 32, and the like are omitted in fig. 4.
Referring to fig. 3 in combination, the lateral dimension of the object 38 located above the first surface 31a of the protective layer 31 is D, and the lateral dimension of the second image sensing module 35 is L, then a trapezoid (as shown by a dotted line in fig. 4) may be constructed with the lateral dimension of the second image sensing module 35 as an upper base and the lateral dimension of the object 38 as a lower base, and then the dimensions of the reflective film 321, the optical filter 39, and the first image sensing module 33 interposed between two waists of the trapezoid may be approximated as the dimensions D2 of the first aperture 3211, the second aperture 391, and the light-transmitting region 331.
Wherein the distance d1 from the center of the object 38 to the protective layer 31 (the protective layer 31 is omitted in fig. 4, and thus the distance from the object 38 to the reflective film 321 is taken as an illustration), the larger the distance d1, the smaller the size d2 of the aperture and the light-transmitting area, and therefore, in order for the second image sensing module 35 to receive as many second light signals as possible, the size d2 of the aperture and the light-transmitting area may be calculated from the minimum distance from the object 38 to the protective layer 31, at which the midfield imaging is performed.
In some embodiments, the distance between the object 38 for midfield imaging and the first surface 31a of the protective layer 31 is in the range of 0.1m to 1m, and in the case of a fixed structural size of the image acquisition device 30, the dimensions D2 of the first aperture 3211, the second aperture 391 and the light-transmitting region 331 may be estimated from d1=0.1m and d=30cm of the object 38. In particular, the dimension d2 may be 2cm.
In other embodiments, the dimensions d2 of the first aperture 3211, the second aperture 391 and the light-transmitting region 331 may also be estimated from d1=0.5 m, d=30 cm of the object 38. In particular, the dimension d2 may be 3.5mm.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an image capturing device 40 according to another embodiment of the present invention.
In some embodiments, the image capture device 40 may include a protective layer 41, a display panel 42, a first image sensing module 43, an optical imaging element 44, and a second image sensing module 45.
In some embodiments, the image capturing device 40 may further include a touch screen 46 disposed between the protective layer 41 and the display panel 42.
This embodiment differs from the embodiment shown in fig. 3 in that: the surface 42a of the second side of the display panel 42 along the thickness direction thereof includes a first area I and a second area II located outside the first area I, the first image sensing module 43 is disposed in the first area I, the optical imaging element 44 is disposed opposite to the second area II, so that the second optical signal passes through the protective layer 41, the touch screen 46, the display panel 42, the first opening 4211 of the reflective film 421 and the second opening 491 of the optical filter 49 in sequence and is directly received by the optical imaging element 44, without passing through the first image sensing module 43, which is beneficial to improving the intensity of the second optical signal received by the second image sensing module 45, however, compared to the embodiment shown in fig. 3, the present embodiment is suitable for realizing fingerprint recognition in a partial area of the first surface 41a of the protective layer 41 (i.e. a partial area opposite to the first area I of the display panel 42).
The structure of the image capturing device 40 in this embodiment is similar to that of the embodiment shown in fig. 2, and the structural design of the image capturing device 40 in the application of the full-screen smart device may refer to the related description of the embodiment in fig. 2, which is not repeated here.
The embodiment of the invention also provides electronic equipment. Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device 50 according to an embodiment of the present invention. The electronic device 50 may comprise a processor 51, a memory 52, and an image acquisition means 53 according to the previous embodiment of the invention.
In some embodiments, the processor 51 is adapted to process the first image data acquired by the first image sensing module and the second image data acquired by the second image sensing module in the image acquisition device 53. The memory 52 is adapted to store reference data in advance and image data acquired by the image acquisition device 53 in real time.
In some embodiments, the electronic device 50 may be a full-screen smart device, the first image data may be fingerprint image data, the second image data may be face image data, the reference data includes fingerprint image data and face image data that are input in advance by a user, the processor is further adapted to compare the first image data and the second image data processed by the processor with the user fingerprint image data and the user face image data stored in advance in the memory 52, respectively, and control unlocking of a screen of the full-screen smart device according to a comparison result.
In some embodiments, the full screen smart device may be a cell phone, or tablet computer.
In summary, the image capturing device according to the embodiment of the present invention has both near-field and mid-field imaging functions, where the protective layer, the display panel and the first image sensor module form a near-field imaging module, and may be used for optical imaging of an object near the first surface of the protective layer (for example, an object contacting the first surface of the protective layer); the optical imaging element and the second image sensing module form a midfield imaging module which can be used for optical imaging of an object with a distance from the first surface of the protective layer within a preset range. The near field imaging module can be applied to off-screen fingerprint identification, the midfield imaging module can be applied to off-screen face identification, so that the image acquisition device can simultaneously realize the off-screen fingerprint identification and the off-screen face identification through the integrated structural design, and the functional integration level of the image acquisition device applied in the comprehensive screen intelligent equipment is improved.
Further, the display panel is arranged on the object focal plane of the optical imaging element, so that a display image on the display panel can be imaged at infinity through the optical imaging element, interference of the display image on the display panel on the second image sensing module to the second optical signal received from an object is avoided, and the signal-to-noise ratio of the image acquired by the second image sensing module is improved; the second image sensing module is arranged outside an image space focal plane of the optical imaging element, so that the optical imaging element can clearly image an object with a distance from the first surface of the protective layer within a preset range to the second image sensing module.
Further, the optical imaging element is arranged opposite to the first image sensing module, and the area, opposite to the optical imaging element, of the first image sensing module has light transmittance, so that the intensity of a second optical signal received by the second image sensing module is enhanced, and the signal to noise ratio of the acquired image is improved.
Further, the image acquisition device further comprises an optical filter device, ambient light can be filtered, only signal light meeting bandpass conditions is allowed to pass through, the signal to noise ratio of an image acquired by the first image sensing module is improved, an opening is formed in an area, opposite to the optical imaging element, of the optical filter device, the optical filter device is prevented from filtering a second optical signal of an object above the surface of the protective layer, and compatibility between near-field imaging and far-field imaging can be achieved.
Further, the image capturing device further includes a reflective film disposed on a surface of the second side of the display panel along the thickness direction thereof, and adapted to reflect the first light signal emitted from the display pixel and directed toward the first image sensing module, so that on one hand, the intensity of the first light signal reaching the first surface of the protective layer for capturing a fingerprint image is enhanced, and on the other hand, the intensity of the first light signal emitted from the display panel and directly entering the first image sensing module is reduced, thereby improving the signal-to-noise ratio of the image captured by the first image sensing module. And an opening is formed in the area, opposite to the optical imaging element, of the reflecting film, so that the reflecting film is prevented from blocking a second optical signal of an object above the first surface of the protective layer, and compatibility between near-field imaging and far-field imaging is realized.
The electronic equipment provided by the embodiment of the invention comprises the image acquisition device, so that the electronic equipment can have the acquisition functions of near-field and far-field images through an integrated structural design, and can be simultaneously applied to off-screen fingerprint identification and off-screen face recognition.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (16)

1. An image acquisition device, comprising: the display device comprises a protective layer, a display panel, a first image sensing module, an optical imaging element and a second image sensing module;
the protective layer is arranged on a first side of the display panel along the thickness direction of the display panel, and the protective layer is provided with a first surface for contacting a part to be detected;
the display panel comprises a plurality of display pixels, and the display pixels are suitable for emitting first light signals;
the optical imaging element and the second image sensing module are arranged on a second side of the display panel along the thickness direction of the display panel;
wherein the first image sensing module is arranged between the display panel and the optical imaging element; a first distance is reserved between the optical imaging element and the display panel, and a second distance is reserved between the optical imaging element and the second image sensing module;
the first image sensing module is suitable for receiving a reflected light signal formed by reflecting the first light signal on the first surface of the protective layer, the optical imaging element is suitable for optical imaging according to a second light signal received by the optical imaging element from above the first surface of the protective layer, and the second image sensing module is suitable for receiving a second light signal imaged by the optical imaging element.
2. The image capturing device of claim 1, wherein the first image sensing module is attached to a surface of the second side of the display panel in a thickness direction thereof.
3. The image capturing device of claim 1, wherein the display panel is disposed within a predetermined range on both sides of an object-side focal plane of the optical imaging element, and the second image sensing module is disposed outside of the image-side focal plane of the optical imaging element.
4. The image capturing device of claim 3, wherein the second distance is adjustable within a preset range, the preset range satisfying: an object located above the first surface of the protective layer and having a distance from the first surface in the range of 0.1 meters to 1 meter forms a clear image at the second image sensing module.
5. The image capturing device of claim 1, wherein the optical imaging element is disposed opposite the first image sensing module and a region of the first image sensing module opposite the optical imaging element is light transmissive.
6. The image capturing device of claim 1, wherein the display panel includes a first area and a second area outside the first area, the first image sensing module is disposed in the first area, and the optical imaging element is disposed opposite to the second area, such that the second optical signal is directly received by the optical imaging element after sequentially passing through the protective layer and the display panel.
7. The image acquisition device of claim 1, further comprising:
the optical filter device is arranged between the display panel and the first image sensing module and is suitable for selecting light rays with incidence angles and wavelengths meeting preset conditions to pass through, and filtering light rays with incidence angles and wavelengths not meeting the preset conditions.
8. The image capturing device of claim 7, wherein a region of the optical filter device opposite the optical imaging element is provided with a light transmissive region.
9. The image acquisition device of claim 1, further comprising: and the reflecting film is arranged on the surface of the second side of the display panel along the thickness direction and is suitable for reflecting the light signals emitted by the display pixels and facing the first image sensing module.
10. The image capture device of claim 9, wherein a region of the reflective film opposite the optical imaging element is provided with a light transmissive region.
11. The image capturing device of claim 1, wherein the first image sensing module is adapted to receive a total reflection light signal formed by total reflection of the first light signal at the first surface of the protective layer.
12. The image acquisition apparatus of claim 11, further comprising:
and the processing module is suitable for sending a display driving signal to the display panel, generating first image information according to the total reflection light signal received by the first image sensing module, and/or generating second image information according to the second light signal received by the second image sensing module.
13. The image acquisition apparatus of claim 12, further comprising: the touch screen is arranged between the protective layer and the display panel and is suitable for detecting touch signals from the first surface of the protective layer;
the processing module is suitable for sending a display driving signal to the display panel when the touch screen detects a touch signal.
14. The image acquisition device of claim 1, wherein the protective layer comprises a light transmissive cover plate; the first image sensing module comprises a plurality of photosensitive pixels, each photosensitive pixel comprises a pixel circuit and a photosensitive element, and the pixel circuit comprises a thin film transistor; and/or the second image sensing module comprises a CMOS image sensor or a CCD image sensor.
15. An electronic device, comprising: a processor, a memory, and an image acquisition device as claimed in any one of claims 1 to 14.
16. The electronic device of claim 15, wherein the electronic device comprises a cell phone, or a tablet computer.
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